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Tangent
01
正接
a straight line that touches a curve or surface at exactly one point, known as the point of tangency
02
正接
(mathematics) the ratio of the opposite to the adjacent side of a triangle that has one angle of 90°
例
In geometry class, we learned how to draw a tangent to a circle, ensuring it only touched the circle at a single point.
She went off on a tangent about what happened to her last summer.
While discussing the book's central theme, she went off on a tangent about the author's background and other unrelated topics.
She often goes off on tangents during her lectures, sharing interesting stories but sometimes losing the main point.
The speaker prated on and on, losing the attention of the audience with each meandering tangent.